<template>
    <div class="tools-div">
        <el-button type="success" size="small" @click="exportData">导出</el-button>
        <el-button type="primary" size="small" @click="importData">导入</el-button>
    </div>

    <!---懒加载的树形表格-->
    <el-table :data="list" style="width: 100%" row-key="id" border lazy :load="fetchData"
        :tree-props="{ children: 'children', hasChildren: 'hasChildren' }">
        <el-table-column prop="name" label="分类名称" />
        <el-table-column prop="imageUrl" label="图标" #default="scope">
            <img :src="scope.row.imageUrl" width="50" />
        </el-table-column>
        <el-table-column prop="orderNum" label="排序" />
        <el-table-column prop="status" label="状态" #default="scope">
            {{ scope.row.status == 1 ? '正常' : '停用' }}
        </el-table-column>
        <el-table-column prop="createTime" label="创建时间" />
    </el-table>



    <el-dialog v-model="dialogImportVisible" title="导入" width="30%">
        <el-form label-width="120px">
            <el-form-item label="分类文件">
                <el-upload
                        class="upload-demo"
                        action="http://localhost:8501/admin/product/category/importData"
                        :on-success="onUploadSuccess"
                        :headers="headers"
                        >
                    <el-button type="primary">上传</el-button>
                </el-upload>
            </el-form-item>
        </el-form>
    </el-dialog>

</template>

<script setup>
import { ref,onMounted } from 'vue';
import { FindCategoryByParentId ,ExportCategoryData} from '@/api/category'
import { useApp } from '@/pinia/modules/app'
import { ElMessage} from 'element-plus'

// 定义list属性模型
const list = ref([
    // { "id": 1, "name": "数码", "orderNum": "1", "status": 1, "createTime": "2023-05-22", "hasChildren": true },
    // { "id": 2, "name": "手机", "orderNum": "1", "status": 1, "createTime": "2023-05-22" },
])


const dialogImportVisible = ref(false)


const headers = {
  token: useApp().authorization.token     // 从pinia中获取token，在进行文件上传的时候将token设置到请求头中
}

onMounted(async()=>{
    const {code,message,data} = await FindCategoryByParentId(0) //页面初始化，只查询所有一级分类
    list.value = data 
})


// 加载数据的方法
const fetchData = async(row, treeNode, resolve) => {

    // 向后端发送请求获取数据
    //const data = [
        // { "id": 3, "name": "智能设备", "orderNum": "1", "status": 1, "createTime": "2023-05-22" },
        // { "id": 4, "name": "电子教育", "orderNum": "2", "status": 1, "createTime": "2023-05-22" },
    //]

    const {code,message,data} = await FindCategoryByParentId(row.id)

    // 返回数据
    resolve(data)

}





const exportData = () => {
  // 调用 ExportCategoryData() 方法获取导出数据
  ExportCategoryData().then(res => {
      // 创建 Blob 对象，用于包含二进制数据
      const blob = new Blob([res]);             
      // 创建 a 标签元素，并将 Blob 对象转换成 URL
      const link = document.createElement('a');  //   <a href="blob">分类数据.xlsx</a>
      link.href = window.URL.createObjectURL(blob);
      // 设置下载文件的名称
      link.download = '分类数据.xlsx';
      // 模拟点击下载链接
      link.click();
  }) 
}

const importData = ()=>{
    dialogImportVisible.value = true 
}
// 上传文件成功以后要执行方法
const onUploadSuccess = async (response, file) => {
  ElMessage.success('操作成功')
  dialogImportVisible.value = false
  const { data } = await FindCategoryByParentId(0)
  list.value = data ; 
}

</script>

<style scoped>
.search-div {
    margin-bottom: 10px;
    padding: 10px;
    border: 1px solid #ebeef5;
    border-radius: 3px;
    background-color: #fff;
}

.tools-div {
    margin: 10px 0;
    padding: 10px;
    border: 1px solid #ebeef5;
    border-radius: 3px;
    background-color: #fff;
}
</style>